Re: [Sablevm-developer] native libs

[Prof. E. M. G. <eti...@uq...>]

OK.  I'm back!  :-)

I'll look at this tomorrow.  You're on Debian/x86, right?

Etienne

David Paul BELANGER wrote:
> Hi,
>=20
> I'm getting a segmentation fault when trying to load a native library.
> The system native library (libjava-lang, libjava-io) get properly loade=
d
> but when it comes to mine, it seems that the pointer passed to the
> memory allocator is null.  My library seems to get properly loaded (the=

> handle is non-null).
>=20
> I have included some gdb output and a simple Hello program that cause
> the error.
>=20
> Thanks,
> David
>=20
>=20
> ---
>=20
> David B=E9langer
> Graduate Student
> School of Computer Science
> McGill University
> Office: MC226
>=20
> Web page:   http://www.cs.mcgill.ca/~dbelan2/
> Public key: http://www.cs.mcgill.ca/~dbelan2/public_key.txt
>=20
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 1024 (LWP 10068)]
> 0x40029cbe in _svmf_cl_alloc (env=3D0x804d548, class_loader_info=3D0x80=
636b8,=20
>     size=3D12, ptr=3D0x0) at class_loader_memory_manager.c:139
> 139     class_loader_memory_manager.c: No such file or directory.
>         in class_loader_memory_manager.c
> (gdb) backtrace
> #0  0x40029cbe in _svmf_cl_alloc (env=3D0x804d548, class_loader_info=3D=
0x80636b8,=20
>     size=3D12, ptr=3D0x0) at class_loader_memory_manager.c:139
> #1  0x40029dd4 in _svmf_cl_zalloc (env=3D0x804d548, class_loader_info=3D=
0x80636b8,=20
>     size=3D12, ptr=3D0x0) at class_loader_memory_manager.c:181
> #2  0x4002aab2 in _svmh_cl_zalloc_native_library (env=3D0x804d548,=20
>     class_loader_info=3D0x80636b8, ptr=3D0x0) at cl_alloc.c:585
> #3  0x400890ea in Java_java_lang_Runtime_nativeLoad (_env=3D0x804d548, =

>     this=3D0x8060028, _filename=3D0x8060610) at java_lang_Runtime.c:246=

> #4  0x400df6ff in ffi_call_SYSV () from /usr/lib/libffi.so.2
> #5  0x400df41a in ffi_call () from /usr/lib/libffi.so.2
> #6  0x400334f8 in _svmf_invoke_native_nonstatic (env=3D0x804d548) at na=
tive.c:1171
> #7  0x40071b53 in _svmf_interpreter (_env=3D0x804d548)
>     at instructions_switch.c:9839
> #8  0x40027270 in _svmh_invoke_specific_static_clinit (env=3D0x804d548,=
=20
>     method=3D0x4145046c) at method_invoke.c:5061
> #9  0x40088c9e in Java_java_lang_Class_step8 (_env=3D0x804d548, _class=3D=
0x805fd98,=20
>     vmData=3D0x80607a0) at java_lang_Class.c:741
> #10 0x400df6ff in ffi_call_SYSV () from /usr/lib/libffi.so.2
> #11 0x400df41a in ffi_call () from /usr/lib/libffi.so.2
> #12 0x40032bf8 in _svmf_invoke_native_static (env=3D0x804d548) at nativ=
e.c:834
> #13 0x40071aa4 in _svmf_interpreter (_env=3D0x804d548)
>     at instructions_switch.c:9791
> #14 0x4001fbaa in _svmh_invoke_nonvirtual_jlclass_initialize (env=3D0x8=
04d548,=20
>     this=3D0x8065b08, param_1=3D1) at method_invoke.c:352
> #15 0x4003dcaa in _svmf_class_initialization (env=3D0x804d548, class=3D=
0x41450008)
>     at initialization.c:24
> #16 0x4008c6d5 in Java_java_lang_VirtualMachine_invokeMain (_env=3D0x80=
4d548,=20
>     _class=3D0x805fda8, mainClass=3D0x805fdb8, args=3D0x805fdc8)
>     at java_lang_VirtualMachine.c:47
> #17 0x400df6ff in ffi_call_SYSV () from /usr/lib/libffi.so.2
> #18 0x400df41a in ffi_call () from /usr/lib/libffi.so.2
> #19 0x40032bf8 in _svmf_invoke_native_static (env=3D0x804d548) at nativ=
e.c:834
> #20 0x40071aa4 in _svmf_interpreter (_env=3D0x804d548)
>     at instructions_switch.c:9791
> #21 0x40057a60 in CallStaticVoidMethod (_env=3D0x804d548, cls=3D0x805f1=
98,=20
>     methodID=3D0x41250818) at native_interface.c:14894
> #22 0x0804aa4d in main (argc=3D2, argv=3D0xbffff8e4) at sablevm.c:1434
> (gdb)=20
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
>=20
> public class Hello {
>=20
>   static {
>     System.loadLibrary("hello");
>   }
>=20
>   private static native void printHello();
>=20
>=20
>   public static void main(String[] args) {
>     printHello();
>   }
>=20
> }
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
> #include "Hello.h"
>=20
> #include <stdio.h>
>=20
> JNIEXPORT void JNICALL Java_Hello_printHello
> (JNIEnv *env, jclass c) {
>   printf("Hello!\n");
> }
>=20
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
> /* DO NOT EDIT THIS FILE - it is machine generated */
> #include <jni.h>
> /* Header for class Hello */
>=20
> #ifndef _Included_Hello
> #define _Included_Hello
> #ifdef __cplusplus
> extern "C" {
> #endif
> /*
>  * Class:     Hello
>  * Method:    printHello
>  * Signature: ()V
>  */
> JNIEXPORT void JNICALL Java_Hello_printHello
>   (JNIEnv *, jclass);
>=20
> #ifdef __cplusplus
> }
> #endif
> #endif
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
> all:
> 	libtool gcc -c -g -o hello.lo -I../../../../include Hello.c
> 	libtool gcc -o libhello.la -g hello.lo -rpath `pwd`
> 	libtool install -c libhello.la `pwd`/libhello.la

--=20
Etienne M. Gagnon, Ph.D.             http://www.info.uqam.ca/~egagnon/
SableVM:                                       http://www.sablevm.org/
SableCC:                                       http://www.sablecc.org/